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Topic Area: Optical Physics
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Displaying records 1 to 10 of 66 records.
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1. A 12.5 GHz-Spaced Optical Frequency Comb Spanning >400 nm for Infrared Astronomical Spectrograph Calibration
Topic: Optical Physics
Published: 6/10/2010
Authors: Franklyn J Quinlan, Gabriel George Ycas, Steve Osterman, Scott A Diddams
Abstract: A 12.5 GHz-spaced optical frequency comb locked to a Global Positioning System disciplined oscillator for near IR spectrograph calibration is presented. The comb is generated via filtering a 250 MHz-spaced comb. Subsequent nonlinear broadening of the ...

2. A coherent dual-comb spectrometer at 3.4 {mu}m for accurate line center measurement of methane
Topic: Optical Physics
Published: 10/10/2011
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, Ian R Coddington, William C Swann, Alexander M. Zolot, Nathan Reynolds Newbury
Abstract: Doppler-broadened methane lines around 3.4 {mu}m are measured with a coherent dual-comb spectrometer with an absolute-frequency axis. The obtained accuracy of the line-center frequency is 300 kHz, about 1 part per thousand of the linewidth.

3. A comb-calibrated FMCW LADAR for absolute distance measurements
Topic: Optical Physics
Published: 6/15/2013
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, Ian R Coddington, Laura C Sinclair, Kevin O. (Kevin) Knabe, William C Swann, Nathan Reynolds Newbury
Abstract: We present a comb calibrated frequency-modulated continuous wave (FMCW) LADAR system for absolute distance measurements to diffuse or specular surfaces. The FMCW LADAR uses a MEMS-based external cavity laser that is swept quasi-sinusoidally over 1 TH ...

4. A deep-UV optical frequency comb at 205 nm
Topic: Optical Physics
Published: 5/25/2009
Authors: Scott A Diddams, E Peters, P Fendel, S Reinhardt, T W Hansch, T Udem
Abstract: By frequency quadrupling a picosecond pulse train from a Ti:sapphire laser at 820 nm we generate a frequency comb at 205 nm with nearly bandwidth-limited pulses. The nonlinear frequency conversion is accomplished by two successive frequency doubling ...

5. A versatile light-emitting-diode-based spectral response measurement system for photovoltaic device characterization
Topic: Optical Physics
Published: 6/29/2012
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: An absolute differential spectral response measurement system for solar cells is presented. The system couples an array of light emitting diodes (LEDs) with an optical waveguide to provide large area illumination. Two unique yet complementary measur ...

6. Accurate, inexpensive testing of handheld lasers for safe use and operation
Topic: Optical Physics
Published: 3/7/2013
Authors: Marla L Dowell, Joshua Aram Hadler
Abstract: An accurate, inexpensive test bed for measurements of optical power emitted from handheld lasers is described. Our test bed consists of a thermopile detector, bandpass optical filters, an adjustable iris, and self-centering holders for mounting of th ...

7. Airless Solar System Bodies: Improvements to Radiative Transfer Modeling of Reflectance Spectra
Topic: Optical Physics
Published: 11/2/2010
Author: Nhan V Nguyen

8. Application of nanoporous silicon substrates for terahertz spectroscopy
Topic: Optical Physics
Published: 12/20/2012
Authors: Edwin J Heilweil, Shu-Zee A. Lo, Gagan Kumar, Thomas E. Murphy
Abstract: Infrared spectroscopy is a valuable tool for probing and characterizing the macro-molecular motions of complex molecules, including vibrational and phonon modes that cannot be easily accessed through visible spectroscopy. We describe here an impro ...

9. Book Review: Nonlinear Laser Dynamics: From Quantum Dots to Cryptography
Topic: Optical Physics
Published: 9/24/2012
Author: Gregg M. Gallatin

10. Calibration of a Radiance Standard for the NPP/OMPS Instrument
Topic: Optical Physics
Published: 10/9/2008
Authors: Bettye C Johnson, James J. Butler, Scott J. Janz, Robert D. Saunders, John W. Cooper, Matthew G. Kowalewski, R Barnes
Abstract: In June 2007, a spherical integrating source was calibrated in the National Aeronautics and Space Administration(NASA) Goddard Space Flight Center‰s (GSFC) Calibration Facility as part of the prelaunch characterization program for the NPOESS Pre ...

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